<!DOCTYPE html>
<html>
<body>
    <h1>JavaScript Promise</h1>
    <p id="demo"></p>
    <script>
        function myDisplayer(some) {
            document.getElementById("demo").innerHTML = some;
        }
        let myPromise = new Promise(function (myResolve, myReject) {
            let x = 5;
            // 一些代码（请尝试将 x 改为 5）
            if (x == 0) {
                myResolve("OK");
            } else {
                myReject("Error");
            }
        });
        myPromise.then(
            function (value) {
                myDisplayer(value);
            },
            function (error) {
                myDisplayer(error);
            }
        );
    </script>
</body>
</html>